Tiling on caber flooring on a new build

[brickyman]

Hi all. I am tiling a few floors for a friend on a new build. Is it ok to tile straight over caber flooring? Its well fixed down and i was thinking a thick coat of PVA and flexible adhesive and grout should do the trick. Any thoughts?

thanks

[stoner]

Hi, never heard of the term caberfloor but it looks like chipboard to me. Personally i would over board with 15mm wbp or tile backer boards. Big no no to pva also, always use acrylic primer for tiling!! Some have tiled on chipboard with no problems but it's not worth the risk.

[grumpygrouter]

DEF No to pva...it has no place in tiling. Much better to use a proper acrylic primer and definately overboard with a cement based backer board....as long as you have no deflection!

[brickyman]

there is not much deflection so was gona overboard with 9mm ply screwed every 150mm

[Bri]

9mm ply is too thin and will warp if it gets wet. Use 6mm hardie backer, much more suitable for the job.

[brickyman]

what ply thickness is best then

[jwatson]

15mm ply is british standard minimum. when over boading.

[Bri]

British standard is 15mm minimum.

[jwatson]

and screwed every 300mm or less. i screw 200mm personaly

[brickyman]

even if the floor is 15mm chipboard with not much bounce at all

[Bri]

Chipboard is probably the worst thing to tile to, except maybe sand, but seriously just get some backer boards, the job will last and be of a good quality and you won't have to go back and fix it when the tiles come loose, which they will if you tile on chipboard.

[Dave]

It is not just to do with deflection for the use of ply.. 15mm offers the best resistance to water ingression and BS5235 does state that is minimum to be used.

You can however ass said above use a backerboard like Hardibacker250.. these are water resistant and do not swell or leach resins like ply can..

[jwatson]

even if the floor is 15mm chipboard with not much bounce at all

yes even with the chipboard @ that thickness. layed staggered 2mm expansion gap between boards and primed back and sides

[brickyman]

so how do you get over the height rise outside that room where there is a carpet. Wouldnt it look funny?

[Bri]

You can get threshold strips to connect the 2. If you use a 6mm backer board you will find that the difference between the backer + tile and carpet + underlay, isn't that different.

[brickyman]

any tips for cutting the copper pipe holes out of porcelain tiles

[Dave]

any tips for cutting the copper pipe holes out of porcelain tiles

Is there any TRV's on the pipes..?

[brickyman]

trv's?

[Dave]

Radiator valves..

[brickyman]

nothing in there at the minute. Just the pipe work (water and soil pipe) sanitary ware getting fitted after tiling. I think this makes for a better job?

[Dave]

It does yes..

The you will need some 365 hole cutters..

[brickyman]

standard adjustable cutter from screwfix wont do it then?

[Dave]

If they are soft tiles then probs ye..

The choice is yours.. We can only advise the way to go..

[brickyman]

do tile shops have these?

[Dave]

Plumb center does.. not sure on tile shops but most have their own brands of hole cutters anyway

[brickyman]

what size is best to cut out a hole for 15mm pipe? roughly what cost?

[Dave]

I would use 18mm hole cutter.. and then use a pipe collar to hide where the pipe comes through the tile.

Cost.. Depends upon brand..

[Rich]

Could not agree more with the guys above Have a quick read through the link below for a little bit more info on the floor.



Plywood floors...

[brickyman]

will 6mm backer boards strengthen the floor enough on an 18mm chipboard to tile over with no deflection?

[Mike]

backer boards offer little in strenghth to the floor, but if you say the floor is deflection free it should be ok but you would be better going to 10mm boards